You can cite many reasons: Amitabh Bachhan, Dhanush, R Balki, Illiaraja, Films promo looks good, Film looks fresh etc etc….. recently I saw the second trailer: Shamitabh‘s 2nd trailer is mindblowing! The mannerisms of Amitabh Bachchan which Dhanush copied with finesse, the Immortal voice of Amitabh on Dhanush’s face…. and the Dialogue: Ye awaz kisi kutte ke muh se bhi achchi lagegi! simply leave you awestruck!!